RU164371U1 - LATCH WITH COMPENSATION CAMERA - Google Patents

Abstract

A valve with a compensation chamber, including a shutter, a spindle, an actuator, a housing, a cover with a sealing element, a compensation chamber connected by a channel with an internal cavity formed by the housing and the cover, characterized in that a locking element is installed on the spindle, which is located at such a distance from the upper part the shutter, that when the shutter position is “open”, it closes the channel connecting the internal cavity formed by the housing and the lid with the internal cavity of the compensation chamber, and in the “closed” position the specified channel It is open.

Description

The device relates to mechanical engineering, namely to valve engineering and can be used as shutoff valves in pipelines of nuclear power plants, thermal power plants, trunk oil and gas pipelines.

Known pressure compensator for wedge gate valves [RU 131116 U1, 08/10/2013] containing a bypass valve having a hollow body with inlet, outlet and middle channels for communicating the body cavity, respectively, with inlet, outlet pipes and the middle valve cavity, as well as elements for connecting said channels with corresponding nozzles and, if necessary, with a middle cavity, while a spool is installed in the cavity of the valve body with the ability to move to the side of lower pressure of the medium under the action of overpressure inlet or outlet channels with overlapping outlet or inlet channels of the valve body, respectively. The known pressure compensator for wedge gate valves is designed to relieve excess pressure of a liquid medium (oil) arising in the middle cavity of a wedge gate valve due to technological heating due to the difference in the coefficients of linear expansion of the conducted medium (oil) and the valve body metal with a closed valve, into one of the nozzles, having a lower pressure of the conducted medium than in the middle cavity of the valve. In this case, the compensator ensures tightness during the operation of the valve.

A disadvantage of the known design of the pressure compensator for wedge gate valves [RU 131116 U1, 08/10/2013] is the lack of reliability and low manufacturability due to the complexity of the design.

Known gate valve [RU 2208731 C1, 07/20/2003] comprising a housing, a cover, a gate and a rod with sealing units. The latter are established with the formation of an annular cavity between them. This cavity is connected to the atmosphere through a normally closed valve. This cavity is connected to the valve cavity through a shut-off device. The shut-off device is made in the form of a cylinder divided by a piston into adjacent cavities. One of the adjacent cavities is in communication with the annular cavity, the other with the body cavity. The cylinder is equipped with a rod with an outlet to the atmosphere, having the ability to interact with the piston. The cylinder rod is hollow and has a back-closed valve.

The disadvantage of the known design of the pressure compensator for wedge gate valves [RU 2208731 C1, 07/20/2003] is the lack of reliability and low manufacturability due to the complexity of the design.

The closest in essential features to the design of the proposed device and taken as a prototype is the known design of the slide gate valve [RU 2496041 C1, 10.20.2013], including a housing with a compensation chamber, inlet and outlet pipes, a gate connected to the rod, a sealant, a drive. The gate is made in the form of an elastic cup and is equipped with a sub that is rigidly connected to the embedded part, which is installed in the end of the cup, in the axial channel of which an annular spring is installed, made with the possibility of being pushed from above by a sub connected to the rod, while the lower ring of the annular spring is installed on the bottom cup and equipped with a tube passed through a jumper into the cavity of the compensation chamber, and in the sub there is a drainage channel connecting the axial channel of the housing above the cup through wheelhouse with compensation chamber equipped with a bypass valve.

The disadvantage of the design of the known gate valve [RU 2496041 C1, 10.20.2013] is the lack of reliability and low manufacturability due to the complexity of the design.

The technical result of the proposed device is to increase reliability in operation by reducing the likelihood of siltation of both the internal cavity of the compensation chamber and the channel connecting the internal cavity of the valve with the compensation chamber while ensuring a high degree of adaptability of its design.

The technical result is achieved by the fact that in the valve with a compensation chamber including a shutter, a spindle, an actuator, a housing, a cover with a sealing element, a compensation chamber connected by a channel with an internal cavity formed by a housing and a cover, according to a utility model, a locking element is installed on the spindle, which is located at such a distance from the top of the shutter that when the shutter is “open”, it closes the channel connecting the internal cavity formed by the housing and the lid with the internal cavity second chamber and in the "closed" said channel is open.

In FIG. 1 shows a General view of the device in longitudinal section in the shutter position "closed". In FIG. 2 shows a General view of the device in longitudinal section in the shutter position "open".

The device includes a housing 1 provided with a cover 2, a sealing element 3 installed in the hole of the cover 2 through which the spindle 8 passes, and ensuring the tightness of the movable cover-spindle connection. On the outer surface of the device, a compensation chamber 4 is installed, which is connected through the channel 5 to the internal cavity 6 of the device, which is formed by the housing 1 and cover 2. The spindle 8 is connected at one end to the actuator 9 and the other end to the shutter 7. A locking element is installed on the spindle 8 10. Compensation chamber 4 can be made, for example, elastically deformable in the form of a hollow sleeve with a corrugated wall, which will allow it to increase in size with increasing pressure in the internal cavity 6 of the device and return original dimensions as the pressure normalization.

The locking element 10 is mounted on the spindle 8 at such a distance from the upper part of the shutter 7 that, when the shutter 7 is “open”, it closes the channel 5 connecting the internal cavity 6, formed by the housing 1 and the cover 2, with the internal cavity of the compensation chamber 4, and in closed position, the specified channel 5 is open.

The proposed device operates as follows.

When the shutter 7 is in the "open" position, free flow of the working medium through the device is carried out. In this case, the working medium will inevitably fall into the internal cavity 6 of the device, formed by its body 1 and cover 2. Moreover, a plaque may appear on the inner walls of the internal cavity 6 of the device, i.e. their siltation occurs. Thanks to the locking element 10, the channel 5 will be closed, which will prevent the working medium from entering the channel 5 and the compensation chamber 4. This will prevent siltation of the channel 5 and the internal cavity of the compensation chamber 4 and thereby extend their service life and increase the reliability of the device.

When the shutter 7 is in the closed position, the channel 5 is open. Thus, as a result of the occurrence of excessive pressure in the inner cavity 6, for example, as a result of an increase in temperature, the expansion chamber 4 expands, communicating with the channel 5 to the inner cavity 6 having an elastically deformable corrugated wall, due to this, pressure compensation occurs and the valve body parts do not experience excessively large loads. As the pressure decreases in the internal cavity 6 of the device (when the shutter 7 is opened or the medium is cooling), the compensation chamber 4 is compressed, returning to its original size.

Due to the presence of the compensation chamber 4, which communicates with the internal cavity 6 of the device, the reliability is improved due to the elimination of harmful consequences in the form of a rupture of the housing 1 and the cover 2 of the device, extrusion of the working medium from the internal cavity 6 of the device into the environment through the sealing element 3 under the action excess pressure in the internal cavity 6 of the device.

Since the working medium, in particular oil, may contain particles prone to settling on the walls of the body parts in stagnant zones of movement, siltation of the internal surfaces in contact with it, including channel 5 and the internal cavity of the compensation chamber 4, will occur.

For most of the life of the device, the device will operate in the shutter position 7 “open”, and due to the presence of the shut-off element 10, the working medium will be prevented from entering the channel 5 and the compensation chamber 4, and therefore their siltation. Excessive siltation of the compensation chamber 4 will lead to a significant deterioration in its compensation properties, which may cause the failure of the device.

The presence of the locking element 10 mounted on the spindle 8 will help to increase the reliability of the device by reducing the likelihood of siltation, as the inner cavity 6 of the compensation chamber 4, and the channel 5, connecting the inner cavity 6 of the device with the compensation chamber 4.

Claims (1)

A valve with a compensation chamber, including a shutter, a spindle, an actuator, a housing, a cover with a sealing element, a compensation chamber connected by a channel with an internal cavity formed by the housing and the cover, characterized in that a locking element is installed on the spindle, which is located at such a distance from the upper part the shutter, that when the shutter position is “open”, it closes the channel connecting the internal cavity formed by the housing and the lid with the internal cavity of the compensation chamber, and in the “closed” position the specified channel It is open.

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